Multi Level Decks

What Is a Multi-Level Deck?

A multi-level deck is any stacked deck system, two or three decks built on top of each other, each serving a different floor or unit. They’re the standard configuration for duplexes, triplexes, Boston-style three-families, and multi-unit condos throughout the Worcester and greater Boston area.

Unlike a single-story deck, multi-level builds involve working 50 feet or more off the ground. The structural engineering, permitting, footing requirements, and on-site logistics are in a completely different category. Not every contractor is equipped to take them on, and cutting corners on a structure at that height carries real consequences.

Threshold Decks has built multi-level deck systems on multifamily properties across more than 100 cities and towns in Massachusetts. It’s one of our core specialties.

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How We Build — Structural Standards That Exceed Code

Multi-level decks demand more from every component in the system. Threshold builds to a higher internal standard on every project — not just what the town inspector will sign off on.

Posts: 6×6 minimum on every multi-level build – never 4×5
Framing: 2×10 joists on every build regardless if code says less than this is required
Footings: Deeper and Wider than single-level decks: 4,000 PSI concrete
Railing Height: Meets or exceeds commercial-grade requirements at higher elevations

"We build every deck like it's meant to last. We're always meeting or exceeding code — never going below."

Owner, Threshold Decking

The difference in post size alone matters more than most homeowners realize. A 4×4 post has roughly one-third the load capacity of a 6×6. At 40 or 50 feet of elevation, that’s not a technicality — it’s the difference between a deck that performs for decades and one that becomes a liability.

Materials

Every component on a Threshold multi-level deck is specified for durability, performance, and appearance — with no shortcuts on structural elements.

Decking Surface

We use TimberTech composite decking on our multi-level builds. TimberTech offers the performance and low-maintenance profile that’s right for elevated, multifamily applications — no painting, no sealing, and resistant to the moisture and weather cycles that degrade wood over time. As Massachusetts’ largest TimberTech showroom, we carry the full product line and can walk you through options in person.

Frame & Structure

The frame is always pressure-treated lumber — no exceptions. Pressure-treated framing is the industry standard for structural applications exposed to the elements, and it’s what we specify on every project regardless of cost pressures.

Railings

Railing framing is always pressure-treated. We finish with composite or TimberTech railing systems on top — durable, attractive, and low maintenance. Commercial properties and higher-elevation decks are subject to stricter railing height requirements once certain floor thresholds are exceeded; we know those specs and build to them automatically.

Engineering & Permits

Multi-level decks almost always require engineer-stamped drawings — in our experience, that’s approaching 100% of projects. This is not a formality. Stamped plans document the load calculations, footing design, and framing specifications that make a multi-level structure safe and insurable.

Threshold works with established engineering relationships to produce stamped drawings efficiently. We manage that process so you don’t have to find an engineer on your own or navigate the handoff between the design and permit phase.

Permitting is submitted directly to each municipality. Requirements vary town by town across Massachusetts, and we handle the submission and follow-up with the local building department. By the time we break ground, every approval is in order.

Stairs, Landings & Egress

A multi-level deck isn’t just a question of surface area — it’s a vertical circulation system. Code requires a dedicated egress staircase for each upper-floor unit, and multi-level builds typically call for landings at each level, not a single staircase running straight from the top to the ground.

Threshold includes proper landings as a standard part of every multi-level build. Landings improve safety, meet egress requirements, and make the transition between levels feel intentional rather than like an afterthought. They also provide a natural spot for outdoor furniture, grills, or planters at each floor.

We design the stair and landing layout as part of the overall project plan — it’s not something we figure out after the decks are framed.

What to Watch Out for When Getting Quotes

Multi-level decks attract contractors who aren’t equipped for the work. These are the shortcuts we see most often — and why they matter:

4×4 posts on elevated structures. Using undersized posts is one of the most common cost-cutting moves on multi-level builds. At height, post load capacity is critical — 4×4s don’t belong on this type of structure.
2×8 framing instead of 2×10. Some contractors frame to the minimum code allows. We frame to what the load and height actually demand — 2×10 on every multi-level project.
Shallow footings and low-grade concrete. Footings on multi-level decks need to be deeper and larger to handle the added load. Threshold uses 4,000 PSI concrete — a higher spec than many contractors use on residential work.
Inexperienced crews working at height. The physical difficulty of building 40–50 feet off the ground gets underestimated. A crew that does single-story decks is not the same as a crew experienced in multi-level construction.

If you’re getting quotes, ask every contractor what size posts and joists they plan to use, what PSI concrete they specify, and whether they’ve pulled permits and worked with engineers on multi-level projects before. The answers will tell you a lot.

Common Questions from Homeowners & Landlords

Can the roof or structure above be protected while the deck is being rebuilt?

In approximately 90% of cases, yes. When an upper-level deck needs to be demolished and rebuilt, we can temporarily support the structure above so the units above remain protected and accessible during the project. We assess this during the initial consultation and design the demo sequence accordingly.

What happens when multiple units or owners are involved?

This is the single biggest project management challenge on multifamily jobs. Duplexes and three-families often have multiple owners, tenants in place, or both. Everyone needs to be aligned before work can begin. Threshold has handled this coordination many times — we help facilitate communication between stakeholders and structure the project timeline in a way that keeps the process moving without creating unnecessary disruption for residents.

Why are so many landlords replacing their multi-level decks right now?

Insurance companies have become more aggressive about aging multi-level decks on rental properties. Insurers don’t want the liability exposure, and many are now requiring replacement as a condition of coverage. Tenant pressure is also a factor — residents are more aware of what a safe, well-maintained deck should look like. If you’ve received notice from your insurer or have a deck that hasn’t been inspected in years, it’s worth getting a professional assessment before it becomes a requirement.

Do I need an engineer even if my town hasn’t asked for one?

Almost certainly, yes — especially on a full rebuild. Engineer-stamped plans are required on the vast majority of multi-level deck projects. Beyond the permit requirement, stamped drawings protect you as a property owner. They document that the structure was designed and built to a verified standard, which matters for insurance, resale, and liability. We make it easy by managing the engineering relationship directly.

How long does a multi-level deck project take?

Timeline varies based on the size and complexity of the structure, the permitting timeline with your municipality, and the coordination required with tenants and co-owners. We walk through a realistic project schedule during the consultation so there are no surprises. Lead time also depends on the time of year — spring and summer schedules fill early.

Visit Massachusetts’ Largest TimberTech Showroom!

Visit Threshold Decks Showroom in Leicester, MA

Visit our showroom to compare full size TimberTech decking, railings, lighting, and color combinations side by side. Walk real deck displays, explore design options with our team, and choose the perfect materials for your home before your project begins.

We don’t just build decks. We build long-lasting relationships.

We’re committed to delivering great service every time. If we’ve helped you recently, we’d be grateful if you shared your experience with others.

We loved working with Threshold Decks for our recent deck rebuild! Right from the start, Joe really stood out to us from the small details of taking his shoes off when he walked into the house to the larger sitting down with us right away and helping us understand and visualize what our investment with Threshold Decks would look like. Our project manager Anders was extremely communicative and on site daily to make sure every detail was exactly the way we wanted. These guys build trust from the beginning, are easy to work with/talk to and our new deck is more beautiful than we pictured!

Jamie H.

Threshold Decks did a great job. Overall job was done on time, on budget no surprises. Work staff was knowledgeable, hard working and took pride in their work. Very clean and organized.

Mike G.

From the start to finish, great experience. Scott came out, looked at our vision of the deck and created the perfect blueprint. Project started on schedule and finished ahead of schedule. Quality of work was excellent. Robin and his crew were great. We had a couple of punch list items that were addressed immediately and to our satisfaction. Sitting on the deck right now and happy we went with Threshold Decks. Would highly recommend them for your next project.

Gail A.

The process from start to finish was fantastic! Scott came out and reviewed our project with us. There was no pressure and pricing was in our range. The guys started our screened in porch and did an amazing job even with the few changes we made. The crew and Anthony the supervisor were great to work with. I feel they deserve a 5 star review as they listened to what we wanted, made the changes that we asked for and completed the project with care! Their crews are hard working and did a great job! Superb craftsmanship! Would highly recommend them.

Stephanie H.

Quality workmanship and crew. Very professional every step of the way. Thank you for making the project as smooth as possible, every step of the way.

Joseph P.

We needed to replace twelve 3-level deck towers at Briarwood 1 condominium and Threshold Decks has done a superior job! Another Decking company started the project and raised their prices substantially after completing the first deck tower. Scott Tupper worked with the trustees to develop a solid design plan that allowed us to save 40% on each deck tower. Scott was able to recognize our needs and the new deck towers are better than we expected! Anthony Judice worked so closely and effectively with each of the 33 deck owners that he was always able to go the extra mile to make sure everything was done to their satisfaction! Threshold Decks is a great builder! They are focused on the needs of the customer and work hard to resolve any issues and make the process as smooth as possible! We would recommend them as a builder for anyone!

David F.